Ravens head coach Jesse Minter said Tuesday that Walker (undisclosed) is dealing with "something minor" but is uncertain to play in Sunday's season opener against the Colts, Jonas Shaffer of TheBaltimoreBanner.com reports.
Minter didn't elaborate on the nature of Walker's issue, but is could get cleared up when the Ravens post their first injury report Wednesday. Though Walker's availability for Sunday is looking iffy, Minter said that he expects the third-year wideout to practice in some capacity this week.